/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.kylin.softaffinity.strategy

import org.apache.kylin.softaffinity.SoftAffinityConstants

import scala.collection.mutable.ListBuffer
import org.apache.spark.SparkEnv

trait SoftAffinityAllocationTrait {

  lazy val softAffinityReplicationNum = SparkEnv.get.conf.getInt(
    SoftAffinityConstants.PARAMS_KEY_SOFT_AFFINITY_REPLICATIONS_NUM,
    SoftAffinityConstants.PARAMS_KEY_SOFT_AFFINITY_REPLICATIONS_NUM_DEFAULT_VALUE
  )

  /**
   * allocate target executors for file
   */
  def allocateExecs(file: String,
                    candidates: ListBuffer[Option[(String, String)]]): Array[(String, String)]
}